Grinding and pulverizing mill



Nov. 13, 1928. 1,691,210

B. SCHERBAUM GRINDING AND PULVERZING MILL Nav. 13,1928.

B. SCHERBAUM GRINDING AND PULVERIZING MILL Filed Deo. 25, 1925 2Sheets-Sheet 2 Patented Nov. 13, 1928.

UNITED STATES PATENT oFFICE.

BERNHARD SCHERBAUM, F WEDEL, GERMANY.

GRINDING AND PULVERIZING- MILL.

Application led December 23, 1925, Serial No. 77,355, and in GermanyDecember 31, 1924.

The subject of the present invention is a grinding and pulverizingdevice by which the breaking and grinding at the same time of thesoftest or the hardest materials can be effectively performed, and bywhich at will various of these operations can be carried outin suitablesuccession and number.

^ The accompanying drawing shows by way of example one embodiment of theinvention. Fig. 1 is a vertical section through the mill.

Fig. 2 is an elevation. Fig. 3 is a plan view. Fig. 4 is a section onthe line I--I of Fig. 1. Above and at the side of Fig. 3 are shown theteeth cross-sections taken on the lines II-II and III-III of Fig. 3.

The new mill consists of an outer cylinder or shell which is formed insuperposed crossu sections on its periphery with teeth decreasing inheight and increasing in number continuously or in stages andco-operating with a co-axial solid rotatable body, the outer peripheryof which is correspondingly shaped and carries teeth entering the axialspaces between the rows of teeth of the outer `body. Thus in separatesuperposed cross sections the number oi the teeth increases but theirheight is not reduced. Both the outer and the inner solid body consistof several parts subdivided in planes at right angles to thelongitudinal axis and each removable or interchangeable.

In the embodiment illustrated the outer body consists of live rings, l,2, 3, 4 and 5, which serve in succession for breaking up, coarsegrinding, fine grinding and pulverizing the material fed to the millthrough the hopper 6. The solid inner body which in the embodimentillustrated is rotatable con sists also of five arts, 7, 8,9, 10 and11.- The portions 1 to 5 o the outer body are provided with inter-enfrainfr rojections 12, 13, 14

b g b Y 1 and 15. Therotatab e spindle of the subdivided solid innerbody 7 to 11 is driven through the medium of the intermediate shaft 17,and the bevel pinion gearing 18 is also sub-divided into a number ofparts 19, 20, 21, 22 and 23, which inter-engage by means of squaredextensions. The spindle 19-23 is either keyed in its separate portionsto the corresponding portions ofthe solid body 7-11, or is formed with aplurality of edges by which to transmit the drive to the solid body.

As shown the toothed rings of the solid body 7-11 engage in the axialinter-dental spaces of the toothed rings of the youter body 15, and bothkinds of'teeth taper down- `wardly more or less continuously or insteps.

The number of the teeth increases in the downward direction so that, forexample, two co-operating teeth 24 on the solid and on the outer bodyare provided; four of the teeth 25; six of the teeth 26; eight of theteeth 27; ten of the teethv 28; twelve of the teeth 29; fourteen of theteeth 30; sixteen of the teeth 31; eighteen of the teeth 32 and twentyof the teeth 33 co-operate. The number of teeth of the succeeding negrinder 4-10 from its upper to its lower end amounts for example toforty, fifty, sixty, seventy, eighty and ninety, the lowermost of thepulverizing rings 5, l1, being provided with teeth ot equal height andof greater number.

The mill can also be arranged in such man ner that for example thepreliminary breaker 1, 7, may be omitted and only the coarse grinder 2,8, the fine grinder'3, 9, the meal grinder 4, 10 and the pulverizer 5,11, remain. In 1addition all sorts of variations are possib e.

The parts of the outer body are'held together by fourU-shaped rails 34,distributed around the peripher In addition the parts 1 to 5 of theouter ody are each formed in four or more axially sub-divided segments35, 36, 37 and 38, F1 4.- On each of these segments is provide a cheek.V39 which is held by bolts-40 andtwo pressure screws 41 to the framerails 34. By adjustment of the screws 40 and 41 each ring segment 35.36,37, 38, can be so displaced that the inner periphery of thecorresponding ring is reduced or expanded, or is` given a form differentfromthe rotating body. The consequence of this adjustment is thevariation o f the distance apart of the teeth and when 1t 1s largeenough the cutting out of thls part of the mill.

The meal passing from the pulverizer 5 11 enters a casing 42, which ismaintained under vacuum by means of branches 43, the suction pipeconnected at 44 drawmg 0E the meal. All the teeth are contacted by a.current of air which cools them. The outer sides of all the grindingbodies remain cool, as they are exposed to the air.

I claim: 4

1. A grinding and pulverizing mill comprising an outer body arrangedaxially vertically, said body being formed of superposed sections, saidsections being formed With peripheral teeth, said teeth being of Varyingsize and depth, and a solid inner body coaxial with said outer body,said solid body being formed With corresponding teeth entering theinter-dental spaces of the teeth of the outer body into grindingrelation therewith.

2. A grinding and pulverizing mill comprising an outer body arrangedaxially vertically, said body being formed of superposed sections, saidsections being formed with peripheral teeth, said teeth being of varyingsize and depth, and a solid inner body coaxial. with said outer body,said solid body being formed with corresponding teeth entering theinter-dental spaces of the teeth of the outer body, said inner and outerbodies consisting of interchangeable parts and subdivided in planes atright angles to their longitudinal axls.

3.l A grinding and pulverizing mill com prising an outer body arrangedaxially vertically, said body being formed of superposed sections, saidsections being formed with peripheral teeth, said teeth being of varyingsize and depth, and a solid inner body coaxial with said outer body,said solid body being formed with teeth entering the inter-dental spacesof the teeth of the outer body, the said sections of said inner bodyengaging with one another for rotation as a Whole.

4. A grinding and pulverizing mill comprising an outer body arrangedaxially vertically, said body being formed of superposed sections, saidsections being formed With peripheral teeth, said teeth being of varyingsize and depth, asolid inner body coaxial With said outer body, saidsolid inner body being formed With corresponding teeth ventering theinter-dentalspaces of the teeth of the outer body, the sections of saidsolid body engaging With one another for rotation as a whole, and adriving shaft also subdivided into parts coupled together.

5. A grinding and pulverizing mill comprising an outer bodyarranged'axially vertically, said body being formed of superposedsections, lsaid sections being formed with peripheral teeth, said teethbeing of varying size and depth, a solid inner body coaxial with saidouter body, said solid inner body being formed With teeth entering theinterdental spaces of the teeth of the outer body, the sections of saidouter body consisting of axially sub-divided segments, means r'orholding said segments together normally and means for adjusting thesegments, substantially as and for the purpose set forth.

6. A grinding and pulverizing mill comprising an outer body arrangedaxially vertically, said body being formed of superposed sections, saidsections being formed With peripheral teeth, said teeth being of varyingsize and depth, a solid inner body coaxial with said outer body, saidsolid inner body being formed With teeth entering the inter-dentalspaces of the teeth of the outer body, a casing connected with the lowerof the superposed sections and means for subjecting said casing to anegative pressure.

In testimony whereof I have signed my name to this specification.

BERNHARD SCHERBAUM

